WO1988005698A1 - Applicator with rolling scraper for applying coatings on webs of material - Google Patents

Applicator with rolling scraper for applying coatings on webs of material Download PDF

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Publication number
WO1988005698A1
WO1988005698A1 PCT/EP1988/000087 EP8800087W WO8805698A1 WO 1988005698 A1 WO1988005698 A1 WO 1988005698A1 EP 8800087 W EP8800087 W EP 8800087W WO 8805698 A1 WO8805698 A1 WO 8805698A1
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WO
WIPO (PCT)
Prior art keywords
roller
core
casing
applicator according
scraper applicator
Prior art date
Application number
PCT/EP1988/000087
Other languages
German (de)
French (fr)
Inventor
Herbert Sommer
Original Assignee
Jagenberg Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
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Application filed by Jagenberg Aktiengesellschaft filed Critical Jagenberg Aktiengesellschaft
Priority to DE8888901583T priority Critical patent/DE3860821D1/en
Priority to AT88901583T priority patent/ATE57480T1/en
Publication of WO1988005698A1 publication Critical patent/WO1988005698A1/en
Priority to FI884637A priority patent/FI884637A0/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
    • B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0817—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line characterised by means for removing partially liquid or other fluent material from the roller, e.g. scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
    • B05C1/083—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets being passed between the coating roller and one or more backing rollers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • D21H23/58—Details thereof, e.g. surface characteristics, peripheral speed
    • D21H23/60—Details thereof, e.g. surface characteristics, peripheral speed the material on the applicator roll being subjected to a particular treatment before applying to the paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod

Definitions

  • Roller scraper on framework for applying coatings to material webs
  • the invention relates to a roller scraper applicator for direct or indirect application of coatings to material webs with a doctor rod rotatably mounted in a holder, resting on the material web or on a roller guiding the material web.
  • Roll scraper applicators of this type serve this purpose. Apply primer and top coats directly or indirectly to cardboard and paper.
  • Other, non-pigmented application media for example for surface cleaning. for coating or pretreating technical papers and films are possible.
  • Dry application weights from 0.5 to 20 g / m with the smoothest possible surface, i.e. with a good cross profile without streaking.
  • the thickness of the coating results from a balance of forces between the elastic pressure and the hydrodynamic liquid pressure of the maximras that arises in the wedge-shaped gap between the material web or the roller guiding the material web and the doctor rod.
  • Rotatable doctor rods made of solid steel are known and described in DE-PS 30 22 955. They are well suited for the metered application of pigment coats on paper, so that a desired one
  • doctor blades are less suitable. if a pigmented application medium is to be applied indirectly first to a rubberized roller or directly to a very smooth, closed web surface, for example a film.
  • the hydrodynamic fluid pressure is often so low that the contact pressure cannot be reduced as much as would be necessary without unevenness in the transverse profile, i.e. Streaks with lower and higher order result.
  • the object of the invention is to improve the roller scraper applicator in such a way that there is a wide coat weight range with a good cross profile on different web materials and with a wide variety of coating materials.
  • the doctor rod consists of a core and a sheathing with different elastic modulus.
  • Doctor rod made of solid material in relation to the pressure Reduce relatively high rigidity, so that the doctor rod lies evenly on the material web or aligns the surface of a counter roller.
  • the doctor rod according to the invention consisting of a core and a jacket with different elastic modulus is based on the knowledge that a reduction in the doctor rod diameter alone reduces its rigidity, but does not provide a solution to the problem, since with the reduction in the doctor rod diameter also the hydrodynamic liquid pressure due to the geometric change in the dosing zone, ie with the associated increase in the wedge angle, drops faster than the stiffness of the doctor rod decreases. Conversely, increasing the doctor rod diameter increases the hydrodynamic fluid pressure in the metering zone, but the fluid pressure increases more slowly than the stiffness of the doctor rod increases with increasing diameter.
  • the modulus of elasticity of the sheathing is preferably smaller than that of the core, which can advantageously be achieved in that the sheathing is made of plastic, for example PTFE or PVC, and the core is made of steel.
  • the core absorbs the torsional stress occurring in the doctor rod. while the flexible plastic coating brings the outside diameter to the value that is required for optimal coating.
  • the diameter of the steel core is preferably 6 to 10 mm and the outer diameter of the plastic sheathing is 10 to 20 mm.
  • the surface of the core can be structured to prevent the plastic jacket from shifting or slipping relative to the steel core. eg out of round and the example complementary inner surface of the casing to be positively connected to the surface "of the core.
  • a thin-walled, wear-resistant casing can be placed around the casing, which consists of an approximately 0.3 mm thick steel casing.
  • This embodiment is used in particular for the direct coating of paper webs, since increased wear of the elastic sheathing occurs in this application.
  • the squeegee rod is driven, preferably in the opposite direction to the counter-roller movement or to the material web movement, and is mounted in the holder by means of a squeegee bed from a compressed air hose, so that the contact pressure can be changed by changing the compressed air pressure on the hose.
  • the drawing serves to explain the invention using two exemplary embodiments.
  • the drawing shows:
  • Fig. 1 cutout a roller scraper for direct coating of a paper web which is guided around a counter roller.
  • the coating material is applied directly to a material web.
  • a counter roller 1 of which only one segment is shown. runs a material web 2 and is provided with a coating 3 predetermined square meter weight.
  • excess coating material is removed by means of a doctor rod 5 rotatably mounted in a holder 4.
  • This doctor rod 5 is driven counter to the direction of movement of the counter-roller 1 indicated by an arrow and displaces the unnecessary coating material downwards, where it drips into a tub (not shown).
  • the doctor rod 5 consists of a core 6 made of steel, on which the driving torque acts.
  • the core 6 is with a sheath 7 made of plastic, for example PTFE or PVC. provided and additionally has a wear-resistant shell 8, which in turn consists of steel. This wear-resistant sleeve 8 is required when the coating material and the material web 2 lead to increased abrasion of the doctor rod 5.
  • the doctor rod 5 is held in a doctor bed 9, which consists of a rubber hose with compressed air and a hollow chamber 10.
  • Air pressure in the hollow chamber 10 the contact pressure of the material web 2 and the coating material can be adjusted so that the line application has a perfect surface and its weight per square meter can be varied within wide limits.
  • E x I 0.85 x 10 N / mm only twice; it is still significantly below the bending resistance of a doctor rod of the same diameter made of solid steel.
  • the coating 3 is applied indirectly.
  • the material web 2 is only brought up to the roller when the coating 3 is applied in the manner described in a metered manner to the roller surface instead of to the material web.
  • the coating is then taken over by the material web which is brought up and around the roller 1.
  • the counter-rollers 1 Since the counter-rollers 1 have a rubber or rubber jacket, hardly any abrasion occurs on the doctor rods 5. These therefore do not require a wear-resistant casing. Their construction corresponds to the doctor rod shown in FIG. 1, with the wear-resistant casing 8 missing. The casing 7 of the doctor rods 5 is thus on the counter-rollers 1.
  • a roller applicator 11 with an ink pan 12 and an applicator roller 13 is used in both embodiments 1 ( Figure 2). Dosing to the desired coat weight is then carried out using the roller scrapers 5 according to the invention.

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  • Coating Apparatus (AREA)

Abstract

An applicator with a rolling scraper for directly or indirectly applying fluid coatings (3) on webs of material (2) has a scraping bar (5) rotatably mounted in a support (9) and lying with a variable pressure on a web of material conveyed around a counter-roller (1) or on a web-guiding roller. The scraping bar (5) is composed of a core (6) with a high modulus of elasticity and of an envelope (7) with a low modulus of elasticity, in order to generate uniform coating films from the most different materials with different coating thicknesses.

Description

Rollschaberauf ragwerk zum Auftragen von Beschichtungen auf Materialbahnen Roller scraper on framework for applying coatings to material webs
Technisches GebietTechnical field
Die Erfindung betrifft ein Rollschaberauftragwerk zum direkten oder indirekten Auftragen von Beschichtungen auf Materialbahnen mit einer in einem Halter drehbar gelagerten, auf der Materialbahn oder auf einer die Materialbahn führenden Walze aufliegenden Rakelstange.The invention relates to a roller scraper applicator for direct or indirect application of coatings to material webs with a doctor rod rotatably mounted in a holder, resting on the material web or on a roller guiding the material web.
Derartige Rollschaberauftragwerke dienen dazu. Vor- und Deckstriche direkt oder indirekt auf Karton und Papier aufzutragen. Auch andere, nicht pigmentierte Auftragmedien, beispielsweise zum Oberflachenleiraen. zum Beschichten oder Vorbehandeln technischer Papiere und Folie kommen in Frage. Abhängig von der Laufgeschwindigkeit der Materialbahn, ihrenRoll scraper applicators of this type serve this purpose. Apply primer and top coats directly or indirectly to cardboard and paper. Other, non-pigmented application media, for example for surface cleaning. for coating or pretreating technical papers and films are possible. Depending on the running speed of the material web, its
Materialeigenschaften sowie der Zusammensetzung und dem rheologischen Verhalten der Auf ragmedien strebt manOne strives for material properties as well as the composition and the rheological behavior of the application media
22
Trockenauftraggewichte von 0,5 bis 20 g/m bei möglichst glatter Oberfläche, d.h. bei gutem Querprofil ohne Streifenbildung an.Dry application weights from 0.5 to 20 g / m with the smoothest possible surface, i.e. with a good cross profile without streaking.
Die Dicke der Beschichtung stellt sich aufgrund eines Kräftegleichgewichts zwischen elastischer Anpressung und dem im keilförmigen Spalt zwischen der Materialbahn oder der die Materialbahn führenden Walze und der Rakelstange entstehenden hydrodynamischen Flüssigkeitsdruck des Auf ragsmediuras ein. Stand der TechnikThe thickness of the coating results from a balance of forces between the elastic pressure and the hydrodynamic liquid pressure of the mediuras that arises in the wedge-shaped gap between the material web or the roller guiding the material web and the doctor rod. State of the art
Drehbare Rakelstangen aus Stahlvollmaterial sind bekannt und in der der DE-PS 30 22 955 beschrieben. Sie sind zum dosierten Aufbringen von Pigmentstrichen auf Papier gut geeignet, so daß sich ein gewünschterRotatable doctor rods made of solid steel are known and described in DE-PS 30 22 955. They are well suited for the metered application of pigment coats on paper, so that a desired one
Strichgewichtsbereich bei gutem Querprofil weitestgehend abdecken läßt.Line weight range covered with a good cross profile as far as possible.
Demgegenüber sind diese Rakelstangen weniger gut geeignet. wenn ein pigmentiertes Auftragmedium indirekt zunächst auf eine gummierte Walze oder direkt auf eine sehr glatte, geschlossene Warenbahnoberflache, beispielsweise eine Folie, aufgetragen werden soll.In contrast, these doctor blades are less suitable. if a pigmented application medium is to be applied indirectly first to a rubberized roller or directly to a very smooth, closed web surface, for example a film.
In diesen Fällen ergibt sich häufig ein so niedriger hydro- dynamischer Flüssigkeitsdruck, daß sich der Anpreßdruck nicht so weit herabsetzen läßt, wie das erforderlich wäre, ohne daß sich Ungleichmäßigkeiten im Querprofil, d.h. Streifen mit geringerem und höherem Auftrag ergeben.In these cases, the hydrodynamic fluid pressure is often so low that the contact pressure cannot be reduced as much as would be necessary without unevenness in the transverse profile, i.e. Streaks with lower and higher order result.
Darstellung der ErfindungPresentation of the invention
Der Erfindung liegt die Aufgabe zugrunde, das Rollschaber- auftragwerk so zu verbessern, daß sich ein weiter Strichgewichts- bereich bei gutem Querprofil auf unterschiedlichen Bahnmaterialien und mit den verschiedensten Beschichtungsmaterialien ergibt.The object of the invention is to improve the roller scraper applicator in such a way that there is a wide coat weight range with a good cross profile on different web materials and with a wide variety of coating materials.
Gelöst wird diese Aufgabe dadurch, daß bei einem Rollschaberauftragwerk der eingangs erwähnten Art erfindungsgemäß die Rakelstange aus einem Kern und einer ümmantelung mit unterschiedlich großem Elastizitätsmodul besteht. Auf diese Weise läßt sich die bei einerThis object is achieved in that, in the case of a roller scraper applicator of the type mentioned at the outset, the doctor rod consists of a core and a sheathing with different elastic modulus. In this way, the one
Rakelstange aus Vollmaterial im Verhältnis zur Anpressung relativ hohe Steifigkeit verringern, so daß sich die Rakelstange gleichmäßig an die Materialbahn anlegt bzw. Oberfläche einer Gegenwalze ausrichtet.Doctor rod made of solid material in relation to the pressure Reduce relatively high rigidity, so that the doctor rod lies evenly on the material web or aligns the surface of a counter roller.
Die erfindungsgemäße Rakelstange aus einem Kern und einer Ummantelung mit unterschiedlich großem Elastizitätsmodul beruht auf der Erkenntnis, daß eine Verringerung des Rakelstangen- durchmessers allein zwar deren Steifigkeit verringert, jedoch keine Lösung des Problems ergibt, da mit der Verringerung des Rakelstangendurchmessers auch de hydrodynamische Flüssigkeitsdruck aufgrund der geometrischen Änderung in der Dosierzone, d.h. mit der damit einhergehenden Vergrößerung des Keilwinkels, schneller absinkt, als sich die Steifigkeit der Rakelstange verringert. Umgekehrt führt eine Vergrößerung des Rakelstangendurchmesers zwar zu einer Erhöhung des hydrodynamischen Flüssigkeitsdrucks in der Dosierzone, jedoch steigt der Flüssigkeitsdruck langsamer an als sich die Steifigkeit der Rakelstange mit zunehmendem Druchmesser vergrößert.The doctor rod according to the invention consisting of a core and a jacket with different elastic modulus is based on the knowledge that a reduction in the doctor rod diameter alone reduces its rigidity, but does not provide a solution to the problem, since with the reduction in the doctor rod diameter also the hydrodynamic liquid pressure due to the geometric change in the dosing zone, ie with the associated increase in the wedge angle, drops faster than the stiffness of the doctor rod decreases. Conversely, increasing the doctor rod diameter increases the hydrodynamic fluid pressure in the metering zone, but the fluid pressure increases more slowly than the stiffness of the doctor rod increases with increasing diameter.
Vorzugsweise ist der Elastizitätsmodul der Ummantelung kleiner als der des Kerns, was sich vorteilhafterweise dadurch erreichen läßt, daß die Ummantelung aus Kunststoff, beispielsweise PTFE oder PVC, und der Kern au Stahl besteht. Der Kern nimmt hierbei die in der Rakelstange auftretende Torsionsspannung auf. während die flexible Kunststoffumraantelung den Außendurchmeser auf de Wert bringt, der für ein optimales Beschichten erforderlich ist.The modulus of elasticity of the sheathing is preferably smaller than that of the core, which can advantageously be achieved in that the sheathing is made of plastic, for example PTFE or PVC, and the core is made of steel. The core absorbs the torsional stress occurring in the doctor rod. while the flexible plastic coating brings the outside diameter to the value that is required for optimal coating.
Der Durchmesser des Stahlkerns liegt vorzugsweise bei 6 bis 10 mm und der Außendurchmeser der Kunststoffummantelung bei 10 bis 20 mm.The diameter of the steel core is preferably 6 to 10 mm and the outer diameter of the plastic sheathing is 10 to 20 mm.
Um ein Versetzen oder Verrutschen des Kunststo fmantels gegenüber dem Stahlkern zu verhindern, kann die Oberfläche des Kerns strukturiert. z.B. unrund und die beispielsweise komplementäre Innenfläche der Ummantelung formschlüssig mit der Oberflache"des Kerns verbunden sein.The surface of the core can be structured to prevent the plastic jacket from shifting or slipping relative to the steel core. eg out of round and the example complementary inner surface of the casing to be positively connected to the surface "of the core.
Des weiteren kann zusätzlich eine dünnwandige, verschleißfeste Hülle um die Ummantelung herumgelegt sein, die aus einem etwa 0.3 mm dicken Stahlmantel besteht. Diese Ausführungsform wird insbesondere zum direkten Beschichten von Papierbahnen eingesetzt, da bei dieser Anwendung ein erhöhter Verschleiß der elastischen Ummantelung auftritt.Furthermore, a thin-walled, wear-resistant casing can be placed around the casing, which consists of an approximately 0.3 mm thick steel casing. This embodiment is used in particular for the direct coating of paper webs, since increased wear of the elastic sheathing occurs in this application.
Die Rakelstange ist angetrieben, vorzugsweise gegensinnig zur Gegenwalzenbewegung bzw. zur Materialbahnbewegung, und mittels eines Rakelbetts aus einem druckluftbeaufschlagten Schlauch im Halter gelagert, so daß sich der Anpreßdruck durch Änderung der Druckluftbeaufschlagung des Schlauchs verändern läßt.The squeegee rod is driven, preferably in the opposite direction to the counter-roller movement or to the material web movement, and is mounted in the holder by means of a squeegee bed from a compressed air hose, so that the contact pressure can be changed by changing the compressed air pressure on the hose.
Kurze Beschreibung der ZeichnungBrief description of the drawing
Die Zeichnung dient zur Erläuterung der Erfindung anhand zweier Ausführungsbeispiele. In der Zeichnung zeigt:The drawing serves to explain the invention using two exemplary embodiments. The drawing shows:
Fig. 1 Ausschnittweise ein Rollschaberauftragwerk zum direkten Beschichten einer Papierbahn, die um eine Gegenwalze geführt ist.Fig. 1 cutout a roller scraper for direct coating of a paper web which is guided around a counter roller.
Fig. 2 ein Rollschaberauftragwerk zum beiderseitigen indirekten Beschichten einer Materialbahn. Wege zur Ausführung der Erfindung2 shows a roller scraper applicator for indirect coating of a material web on both sides. Ways of Carrying Out the Invention
Bei der Ausführungsform nach Figur 1 wird das Beschichtungsmaterial direkt auf eine Materialbahn aufgetragen. Um eine Gegenwalze 1, von der nur ein Segmen dargestellt ist. läuft eine Materialbahn 2 und wird mit einer Beschichtung 3 vorgegebenen Quadratmetergewichts versehen. Um dieses Quadratmetergewicht zu erreichen, wir überschüssiges Beschichtungsmaterial mittels einer in einem Halter 4 drehbar gelagerten Rakelstange 5 entfernt.In the embodiment according to FIG. 1, the coating material is applied directly to a material web. Around a counter roller 1, of which only one segment is shown. runs a material web 2 and is provided with a coating 3 predetermined square meter weight. In order to achieve this square meter weight, excess coating material is removed by means of a doctor rod 5 rotatably mounted in a holder 4.
Diese Rakelstange 5 ist entgegen der durch einen Pfeil angegebenen Bewegungsrichtung der Gegenwalze 1 angetriebe und verdrängt das überflüssige Beschichtungsmaterial nach unten, wo es in eine nicht dargestellte Wanne abtropft. Die Rakelstange 5 besteht aus einem Kern 6 aus Stahl, auf den das Antriebsmoment wirkt. Der Kern 6 ist mit einer Ummantelung 7 aus Kunststoff, beispielsweise PTFE oder PVC. versehen und weist zusätzlich eine verschleißfeste Hülle 8 auf, die wiederum aus Stahl besteht. Diese verschleißfeste Hülle 8 ist dann erforderlich, wenn das Beschichtungsmaterial und die Materialbahn 2 zu einem erhöhten Abrieb der Rakelstange 5 führen.This doctor rod 5 is driven counter to the direction of movement of the counter-roller 1 indicated by an arrow and displaces the unnecessary coating material downwards, where it drips into a tub (not shown). The doctor rod 5 consists of a core 6 made of steel, on which the driving torque acts. The core 6 is with a sheath 7 made of plastic, for example PTFE or PVC. provided and additionally has a wear-resistant shell 8, which in turn consists of steel. This wear-resistant sleeve 8 is required when the coating material and the material web 2 lead to increased abrasion of the doctor rod 5.
Die Rakelstange 5 ist in einem Rakelbett 9 gehalten, das aus einem mit Druckluft beaufschlagten Gummischlauch mit einer Hohlkammer 10 besteht. Durch eine Änderung desThe doctor rod 5 is held in a doctor bed 9, which consists of a rubber hose with compressed air and a hollow chamber 10. By changing the
Luftdrucks in der Hohlkammer 10 läßt sich der Anpreßdruck der Materialbahn 2 und dem Beschichtungsmaterial anpassen, so daß der Strichauftrag eine einwandfreie Oberfläche aufweist und sich sein Quadratmetergewicht in weiten Grenzen variieren läßt.Air pressure in the hollow chamber 10, the contact pressure of the material web 2 and the coating material can be adjusted so that the line application has a perfect surface and its weight per square meter can be varied within wide limits.
22
Da der Elastizitätsmodul von PTFE ungefähr 400 N/mm undSince the elastic modulus of PTFE is approximately 400 N / mm and
2 der von Stahl etwa 210 000 N/mm beträgt, ergibt sich für den Biegewiderstand einer Rakelstange mit 12 mm 2 which is approximately 210,000 N / mm for steel, results in the bending resistance of a doctor rod with 12 mm
8 Durchmesser aus Stahlvollmaterial E x I = 2.2 x 108 diameters made of solid steel E x I = 2.2 x 10
2 N/mm . während sich der Biegewiderstand für eine erfindungsgemäße Rakelstange mit einem Kerndurchmesser von 8 mm und einem Außendurchmesser von 12 mm, deren Kern aus2 N / mm. while the bending resistance for one Doctor rod according to the invention with a core diameter of 8 mm and an outer diameter of 12 mm, the core of which
Stahl und deren Ummantelung aus PTFE besteht, E x I = 0,43 x 10 8 N/mm2 ergibt. Der Biegewiderstand der erfindungsgemäßen Rakelstange beträgt somit nur etwa einSteel and its sheathing made of PTFE, E x I = 0.43 x 10 8 N / mm2. The bending resistance of the doctor rod according to the invention is thus only about one
Fünftel desjenigen einer Rakelstange ausFifth of that of a doctor rod
Stahlvollmaterial. Auch wenn zusätzlich noch eine dünnwandige, verschleißfeste Hülle aus Stahl mit einer Wanddicke von 0,3 mm um die Ummantelung aus PTFE herumgelegt ist. erhöht sich der Biegewiderstand mitSolid steel material. Even if an additional thin-walled, wear-resistant steel casing with a wall thickness of 0.3 mm is wrapped around the PTFE casing. the bending resistance increases with
8 28 2
E x I = 0,85 x 10 N/mm nur auf das Doppelte; er liegt immer noch erheblich unter dem Biegewiderstand einer Rakelstange gleichen Durchmessers aus Stahlvollmaterial.E x I = 0.85 x 10 N / mm only twice; it is still significantly below the bending resistance of a doctor rod of the same diameter made of solid steel.
Bei der Ausführungsform nach Figur 2 wird die Beschichtung 3 indirekt auftragen. In diesem Fall wird die Materialbahn 2 erst dann an die Walze herangeführt, wenn die Beschichtung 3 in der beschriebenen Weise dosiert auf die Walzenoberfläche statt auf die Materialbahn aufgetragen ist. Die Beschichtung wird dann von der an die Walze 1 heran- und herumgeführten Materialbahn übernommen.In the embodiment according to FIG. 2, the coating 3 is applied indirectly. In this case, the material web 2 is only brought up to the roller when the coating 3 is applied in the manner described in a metered manner to the roller surface instead of to the material web. The coating is then taken over by the material web which is brought up and around the roller 1.
Da die Gegenwalzen 1 einen Gummi- oder Kautschukmantel aufweisen, tritt kaum Abrasion an den Rakelstangen 5 auf. Diese benötigen daher keine verschleißfeste Hülle. Ihr Aufbau entspricht der in Figur 1 gezeigten Rakelstange, wobei die verschleißfeste Hülle 8 fehlt. Die Ummantelung 7 der Rakelstangen 5 liegt somit an den Gegenwalzen 1 an.Since the counter-rollers 1 have a rubber or rubber jacket, hardly any abrasion occurs on the doctor rods 5. These therefore do not require a wear-resistant casing. Their construction corresponds to the doctor rod shown in FIG. 1, with the wear-resistant casing 8 missing. The casing 7 of the doctor rods 5 is thus on the counter-rollers 1.
Zum Auftragen des Besc ichtungsmaterials im Überschuß dient nach beiden Ausführungsformen ein Walzenauftragwerk 11 mit einer Farbwanne 12 und einer Auftragwalze 13. Die Au tragwalzen 13 schöpfen das Beschichtungsmaterial aus den Farbwannen 12 und tragen es im Überschuß auf die Materialbahn 2 (Figur 1) oder die Gegenwalzen 1 (Figur 2) auf. Die Dosierung auf das gewünschte Strichgewicht erfolgt anschließend mit den erfindungsgemäßen Rollschabern 5. To apply the coating material in excess, a roller applicator 11 with an ink pan 12 and an applicator roller 13 is used in both embodiments 1 (Figure 2). Dosing to the desired coat weight is then carried out using the roller scrapers 5 according to the invention.

Claims

-S -P A T E N T A N S P R Ü C H E -S -PATENT REQUESTS
1.1.
Rollschaberauftragwerk zum direkten oder indirekten Auftragen von Beschichtungen auf Materialbahnen mit einer drehbar gelagerten, auf der Materialbahn oder auf einer die Materialbahn führenden Walze au liegendenRoller scraper applicator for direct or indirect application of coatings to material webs with a rotatably mounted roller lying on the material web or on a roller guiding the material web
Rakelstange, d a d u r c h g e k e n n z e i c h n e t, daß die Rakelstange (5) aus einem Kern (6) und einer Ummantelung (7) mit unterschiedlichem Elastizitätsmodul besteht.Squeegee rod, so that the squeegee rod (5) consists of a core (6) and a casing (7) with different modulus of elasticity.
2.Second
Rollschaberauftragwerk nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t, daß der Elastizitätsmodul der Ummantelung (7) kleiner als der des Kerns (6) ist.Roller scraper applicator according to claim 1, so that the modulus of elasticity of the casing (7) is smaller than that of the core (6).
3. Rollschaberauftragwerk nach Anspruch 1 oder 2, d a ¬ d u r c h g e k e n n z e i c h n e t, daß die Ummantelung (7) aus Kunststoff, der Kern (6) aus Stahl besteht.3. Roller scraper applicator according to claim 1 or 2, d a ¬ d u r c h g e k e n n e z e c h n e t that the casing (7) made of plastic, the core (6) consists of steel.
4. Rollschaberauftragwerk nach Anspruch 3. d a d u r c h g e k e n n z e i c h n e t, daß der Durchmesser des Stahlkerns (6) 6 bis 10 mm und der Außendurchmesser der Kunststoff mmantelung (7) 10 bis 20 mm beträgt. 4. Scraper applicator according to claim 3, characterized in that the diameter of the steel core (6) 6 to 10 mm and the outer diameter of the plastic casing (7) is 10 to 20 mm.
5. Rollschaberauftragwerk nach einem oder mehreren der Ansprüche 1 bis 4, d a d u r c h g e k e n n ¬ z e i c h n e t, daß die Oberfläche des Kerns (6) . strukturiert und die Innenfläche derUmmantelung (7) formschlüssig mit der Oberfläche des Kerns verbunden ist.5. Scraper applicator according to one or more of claims 1 to 4, d a d u r c h g e k e n n ¬ z e i c h n e t that the surface of the core (6). structured and the inner surface of the casing (7) is positively connected to the surface of the core.
6.6th
Rollschaberauftragwerk nach einem oder mehreren der Ansprüche 2 bis 5. d a d u r c h g e k e n n ¬ z e i c h n e t, daß eine dünnwandige, verschleißfeste Hülle (8) die Ummantelung (7) umgibt.Roller scraper applicator according to one or more of claims 2 to 5, that a thin-walled, wear-resistant casing (8) surrounds the casing (7).
7.7.
Rollschaberauftragwerk nach einem oder mehreren der Ansprüche 1 bis 6. d a d u r c h g e k e n n ¬ z e i c h n e t, daß die Rakelstange (5) angetrieben ist.Roller scraper applicator according to one or more of claims 1 to 6. d a d u r c h g e k e n n ¬ z e i c h n e t that the doctor rod (5) is driven.
8. Rollschaberauftragwerk nach Anspruch 7. d a d u r c h g e k e n n z e i c h n e , daß die Rakelstange (5) gegensinnig zur Materialbahnbewegung bzw. der die Materialbahn führenden Walze angetrieben ist.8. roller scraper applicator according to claim 7. d a d u r c h g e k e n n e e c h n e that the doctor rod (5) is driven in opposite directions to the material web movement or the roller guiding the material web.
9. Rollschaberauftragwerk nach einem oder mehreren der9. Scraper applicator according to one or more of the
Ansprüche 1 bis 8. d a d u r c h g e k e n n z e i c h n e t. daß die Rakelstange (5) mittels eines Rakelbetts (9) aus einem mit Druckluft beaufschlagten Schlauch im Halter (4) gelagert ist. Claims 1 to 8. d a d u r c h g e k e n n z e i c h n e t. that the squeegee rod (5) is mounted in the holder (4) by means of a squeegee bed (9) from a hose to which compressed air is applied.
PCT/EP1988/000087 1987-02-07 1988-02-06 Applicator with rolling scraper for applying coatings on webs of material WO1988005698A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE8888901583T DE3860821D1 (en) 1987-02-07 1988-02-06 ROLLER SCRAPER APPLICATION TO APPLY COATINGS ON MATERIALS.
AT88901583T ATE57480T1 (en) 1987-02-07 1988-02-06 ROLLER SCRAPER APPLICATOR FOR APPLYING COATINGS TO MATERIAL WEBS.
FI884637A FI884637A0 (en) 1987-02-07 1988-10-07 RULLSKRAPBESTRYKNINGSMASKIN FOER UTBREDNING AV BESTRYKNINGSMEDEL PAO EN MATERIALBANA.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3703834.6 1987-02-07
DE19873703834 DE3703834A1 (en) 1987-02-07 1987-02-07 ROLLER SCRAPER APPLICATION TO APPLY COATINGS ON MATERIALS

Publications (1)

Publication Number Publication Date
WO1988005698A1 true WO1988005698A1 (en) 1988-08-11

Family

ID=6320512

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1988/000087 WO1988005698A1 (en) 1987-02-07 1988-02-06 Applicator with rolling scraper for applying coatings on webs of material

Country Status (4)

Country Link
EP (1) EP0301061B1 (en)
DE (2) DE3703834A1 (en)
FI (1) FI884637A0 (en)
WO (1) WO1988005698A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0454643A1 (en) * 1990-04-19 1991-10-30 Valmet Paper Machinery Inc. Coating device for coating of a size-press roll, paper or board
EP0533643A1 (en) * 1991-09-16 1993-03-24 Valmet Paper Machinery Inc. Method and coating device for the coating of a size-press roll, paper or board
EP0541502A1 (en) * 1991-11-06 1993-05-12 Valmet Corporation Method and equipment for keeping the coating rod and the rod cradle in a bar coater clean and for prevention of leakage of the lubrication and/or cooling water
WO1994000637A1 (en) * 1992-06-24 1994-01-06 J.M. Voith Gmbh Doctor bar
WO1995016074A1 (en) * 1993-12-06 1995-06-15 Jagenberg Papiertechnik Gmbh Metering system for devices for coating materials webs, especially paper or cardboard webs
WO2000028142A1 (en) * 1998-11-09 2000-05-18 Metso Paper, Inc. Coating bar
JP2013237000A (en) * 2012-05-14 2013-11-28 Jfe Steel Corp Coating apparatus

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DE3937749A1 (en) * 1989-11-14 1991-05-16 Jagenberg Ag Squeegee rod for volumetric dosing of coating material
DE29609053U1 (en) * 1996-05-20 1996-08-22 Voith Sulzer Papiermasch Gmbh Device for the direct or indirect application or final metering of a liquid or pasty medium onto a running material web
FI106139B (en) * 1999-03-26 2000-11-30 Valmet Corp Stavskavare
JP2002239431A (en) * 2001-02-13 2002-08-27 Mitsubishi Heavy Ind Ltd Coating apparatus and method for manufacturing coated paper
DE102005009590A1 (en) * 2005-02-25 2006-08-31 Kiener Maschinenbau Gmbh Dosing device for coating and laminating machines has doctor blade whose scraping edge is flush with separator pointing away from applicator roller to keep out particles
SE531394C2 (en) 2005-08-30 2009-03-17 Mattssonfoeretagen I Uddevalla Ab Coating device and method
CN113106780A (en) * 2021-04-19 2021-07-13 刘小建 Antibacterial kraft paper and preparation method thereof

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DE2307404A1 (en) * 1973-02-15 1974-08-22 Jagenberg Werke Ag DEVICE FOR REGULATING THE APPLICATION THICKNESS WHEN COATING MOVING RAILS OF MATERIAL
GB1449993A (en) * 1973-10-01 1976-09-15 American Can Co Method and apparatus for distributing plastics on an irregular wokpiece surface
DE3022955C2 (en) * 1980-06-19 1982-12-16 Jagenberg-Werke AG, 4000 Düsseldorf Device for regulating the application thickness when coating moving material webs
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0454643A1 (en) * 1990-04-19 1991-10-30 Valmet Paper Machinery Inc. Coating device for coating of a size-press roll, paper or board
EP0674047A3 (en) * 1990-04-19 1999-04-28 Valmet Corporation Coating device for coating of a size-press roll, paper or board
EP0674048A3 (en) * 1990-04-19 1999-04-28 Valmet Corporation Coating device for coating of a size-press roll, paper or board
EP0533643A1 (en) * 1991-09-16 1993-03-24 Valmet Paper Machinery Inc. Method and coating device for the coating of a size-press roll, paper or board
EP0541502A1 (en) * 1991-11-06 1993-05-12 Valmet Corporation Method and equipment for keeping the coating rod and the rod cradle in a bar coater clean and for prevention of leakage of the lubrication and/or cooling water
WO1994000637A1 (en) * 1992-06-24 1994-01-06 J.M. Voith Gmbh Doctor bar
WO1995016074A1 (en) * 1993-12-06 1995-06-15 Jagenberg Papiertechnik Gmbh Metering system for devices for coating materials webs, especially paper or cardboard webs
WO2000028142A1 (en) * 1998-11-09 2000-05-18 Metso Paper, Inc. Coating bar
JP2013237000A (en) * 2012-05-14 2013-11-28 Jfe Steel Corp Coating apparatus

Also Published As

Publication number Publication date
FI884637A (en) 1988-10-07
EP0301061B1 (en) 1990-10-17
DE3860821D1 (en) 1990-11-22
FI884637A0 (en) 1988-10-07
EP0301061A1 (en) 1989-02-01
DE3703834A1 (en) 1988-08-18

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